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A/E Name

Issue Description

A/E Project No.

Month, 00, 0000

SECTION 26 33 53 – three-phase Uninterruptible power systems



          1. Drawings and general provisions of the Contract, including General Conditions and Division 01 Specification Sections, apply to this Section.

          2. Specifications throughout all Divisions of the Project Manual are directly applicable to this Section, and this Section is directly applicable to them.

        2. SUMMARY

          1. General. The scope of UPS work for the project shall include but not be limited to:

1. UPS (Uninterruptible Power Systems) consisting of UPS module(s), battery
disconnect, batteries
, battery cabinet, external maintenance bypass/distribution panel,
associated internal and connector wiring , a supervisory contact module, a Connect UPS
Web SNMP Xhub card and other accessories and options required for a complete and
operating system
which includes programing and other accessories.

          1. The UPS shall automatically maintain AC power within specified tolerances to the critical load, without interruption, during failure or deterioration of the normal power source. The work shall include, but not be limited to, providing a system with the following equipment, functions and operations.

1. The UPS system shall be a single module configuration with one UPS rectifier/inverter module with battery string, static bypass and maintenance bypass, which allows the load to be served from either the module or the utility without interruption.

2. UPS module shall be a static type UPS with a solid state inverter, rectifier/battery charger, static bypass switch, maintenance bypass switch, protective devices, synchronizing circuitry, batteries, battery cabinet, battery circuit breaker and other accessories as specified herein or required.

3. A separate full external bypass distribution panel with interlocked UPS input, bypass and output circuit breaker and UPS power distribution circuit breakers as shown or scheduled on the drawings shall be provided.

4. The UPS shall be modular plug-in design that minimizes the time required to replace a
defective module. UPS modular design shall also be made up one or more detachable modules or cabinets , preferably of the draw-out type and removable from the front. This also provides basic for a scalable UPS system. Modularity and interchangeability of sub-assemblies and printed circuit board assemblies shall be optimized. UPS shall be designed to permit ease of replacement of parts, test points, and terminal shall be such that they are accessible for circuit checking, adjustment and maintenance without the removal of any adjacent module or assembly.

5. All semiconductors in the module shall be protected by fast acting fuses so that the failure of any one power semiconductor will not cause cascading failures. Each fuse shall be provided with a blown fuse indicator on the control panel.

6. UPS system shall have surge protection on the incoming power line side to protect unit from transient voltages.

7. UPS with delta configuration units shall have filtered bypass system.

          1. The manufacturer shall design and furnish all materials and equipment to be fully compatible
            with elect
            rical, environmental, and space conditions at the site. It shall include all equipment to properly interface the AC power source to the intended load and be designed for unattended operation.


          1. The latest published edition of a reference shall be applicable to this Project unless identified by a specific edition date.

          2. All reference amendments adopted prior to the effective date of this Contract shall be applicable to this Project.

          3. All materials, installation and workmanship shall comply with the applicable requirements and standards addressed within the following references:

            1. CSA 22.2, No. 107.3 – Uninterruptible Power Systems

            2. ANSI/IEEE Std C62-41 – IEEE Guide for Surge Voltage in Low Voltage AC Power Circuits

            3. IEEE 485 Sizing of Lead Acid Batteries

            4. NFPA 70 – National Electrical Code

            5. NEMA PE 1 – Uninterruptible Power Systems (UPS), Specifications and Performance Verification

            6. NEMA 250-2008 – Enclosure for Electrical Equipment

            7. UL 1008 – Transfer Switch Equipment

            8. UL 1449 – Surge Protective Devices

            9. UL Standard 1778 – Uninterruptible Power Systems

            10. FCC Part 15, Class A - Radio Frequency Devices

          1. The UPS system shall be ETL listed per UL Standard 1778 Uninterruptible Power Systems, and shall be CSA Certified.

          2. The Quality System for the engineering and manufacturing facility shall be certified to conform to Quality System Standard ISO 9001 for the design and manufacture of power protection systems for computers and other sensitive electronics.


          1. Manufacturer Qualifications. A minimum of ten years experience in the design, manufacture,
            and testing of solid-state UPS systems is required.

          2. Factory Testing. Before shipment, the manufacturer shall fully and completely test the system to ensure compliance with the specification. These tests shall include operational discharge and recharge tests to ensure guaranteed rated performance.

        2. SUBMITTALS

          1. Shop drawing submittals shall include, but not be limited to, the following.

            1. Completely identified and marked catalog cuts of all associated equipment and devices, with all non-applicable items crossed out, or applicable devices clearly hi-lighted and/or identified.

            2. A written description of the system operation (written in this specification format), with all exceptions and/or deviations clearly hi-lighted or identified.

            3. Complete bill of material for all equipment.

            4. A dimensioned drawing showing that the proposed equipment will fit in the space allocated.

            5. Complete control panel wiring diagrams, connection diagrams and schematics identifying all terminals and field connections.

            6. Written statement indicating a 1-year UPS warranty and service agreement as specified. And a 4-year warrant on battery units.

            7. Written battery warranty.

          1. Operation and Maintenance Data.

        1. product DELIVERY, STORAGE and HANDLING

          1. Deliver the UPS in factory-fabricated water resistant wrapping, and mounted on shipping skids.

          2. Store in a clean, dry conditioned space. Maintain factory wrapping until installation and then
            provide an additional heavy canvas or heavy plastic cover to protect units from dirt, water
            construction debris, and traffic.

          3. Handle the UPS carefully to avoid damage to material components, enclosure and finish. The UPS shall be provided with adequate lifting means.

        2. service and warranty

          1. UPS and battery manufacturer shall have an established network of service centers capable of servicing the specified equipment. The nearest service center shall be within 50 miles of the Project Site.

          2. Service center and manufacturer's personnel shall be on call 24 hours a day, 365 days a year. Factory train and certify personnel in the maintenance and repair of the equipment.

          3. UPS Warranty. The UPS manufacturer shall warrant the unit against defects in workmanship
            and materials for 1 years after initial start-up.

          4. Battery Warranty. The battery manufacturer's standard warranty shall be passed through to the end user. The manufacturer shall provide the manufacturing date on each battery unit.


        1. GENERAL

          1. All materials shall meet or exceed all applicable referenced standards, federal, state and local requirements, and conform to codes and ordinances of authorities having jurisdiction.

        2. ups and UPS battery MANUFACTURERS

          1. APC

          2. Liebert

          3. Powerwear

          4. Toshiba


          1. Design Requirements.

            1. The UPS shall be sized to provide the minimum of kW/kVA, and additional 10% of what is indicated on the drawings.

            2. Input and output voltage to the UPS module and external maintenance bypass shall be 480 VAC, three phase, 3-wire.

            3. Battery system shall have a capacity of to power the UPS system full kW output for at least 30 minutes at 25°C.

          1. Modes of Operation. The UPS system shall operate as an on-line reverse transfer system in the following modes:

            1. Normal. The critical AC load is continuously powered by the UPS inverter. The rectifier/charger derives power from the utility AC source and supplies DC power to the inverter, while simultaneously float charge the batteries.

            2. Emergency. Upon failure of utility AC power, the critical AC load is powered by the inverters which, without any switching, obtain power from the battery plant. There shall be no interruption in power to the critical load upon failure or restoration of the utility AC source.

            3. Recharge. Subsequent to restoration of the utility AC power, the rectifier shall automatically reactivate and provide the DC power to the inverter, simultaneously recharging the system battery. This occurs automatically and without interruption to the critical load.

            4. Bypass. In the event that the UPS system must be taken out of service for maintenance or repair, the maintenance bypass switch shall transfer the load to the bypass source. In the event that the UPS must be taken off line due to an overload condition or UPS failure, the internal static bypass switch shall transfer the load to the bypass source. In both cases, the transfer processes shall cause no interruption in power to the critical AC load. A re-transfer from bypass to inverter shall be performed automatically in the event of overload. A re-transfer shall be inhibited if satisfactory synchronization of the inverter and bypass source is not accomplished. The use of the static switch shall not be required during the manual or automatic re-transfer process, therefore increasing reliability.

          1. Performance Requirements. The maximum working voltage, current, and di/dt of all solid-state power components and electronic devices shall not exceed 75% of the ratings established by their manufacturer. The operating temperature of solid-state component sub-assembly shall be greater than 75% of their ratings. Electrolytic capacitors shall be computer grade and be operated at no more than 95% of their voltage rating at the maximum rectifier charging voltage.

        1. UPS Module

          1. Rectifier/Charger. The term rectifier/charger shall denote the solid-state equipment and controls necessary to convert AC to regulated DC for input to the inverter and for charging the battery.

            1. Input Current Total Harmonic Distortion. Reflected input current THD shall be less than 4.5% at full load input current.

            2. AC Input Current Limiting. The rectifier/charger shall include a circuit to limit AC input current to an adjustable level of 100% to 125% of the full input current rating. An optional second circuit shall provide greater limiting (60% to 100%) when signaled by an external contact (i.e., during operation of second UPS). AC input current limit is to be factory set at 115% for normal operation and 60 for optional second UPS operation.

            3. Battery Charge Current Limiting. The rectifier/charger shall include a circuit to limit battery charging current to an adjustable level of 1% to 25% of maximum battery discharge current. An optional second circuit shall provide greater current limiting when signaled by an external contact (i.e., during operation of generators). Battery charge current limit is to be factory set at 10% for normal operation and 1% for generator operation.

            4. Input Current Walk-In. The rectifier/charger shall provide a feature that limits the total initial power requirement at the input terminals to 20% of rated load, and gradually increases power to 100% of full rating over the 15-second time interval. This walk-in shall be graphically displayed on the front of the unit during start-up.

            5. Input Circuit Breaker. The rectifier/charger shall have an input circuit breaker. The circuit breaker shall be of the frame size and trip rating to supply full rated load and recharge the battery at the same time. The circuit breaker shall have an under-voltage release to open automatically when the control voltage is lost. Following are the recommended breaker specifications.

            6. Short Circuit Withstand/Interrupting Rating. The UPS system shall be suitable for use with the available short circuit fault current shown on the drawings and the minimum interrupting rating of circuit breakers associated with the UPS system shall be greater than the available short circuit fault current shown on the drawing.

            7. UPS Module Input Breaker Ratings. The minimum interrupting rating of circuit breakers associated with the UPS systems shall be greater than the available short circuit fault current shown on the drawing.

            8. Fuse Protection. Each AC phase shall be individually fused with fast-acting fuses so that loss of any semiconductor shall not cause cascading failures. Fuses shall be bolted to bus bars at both ends to ensure mechanical and electrical integrity. The display panel on the front of the unit shall indicate a blown fuse occurring on any phase of the rectifier.

            9. DC Filter. The rectifier/charger shall have an output filter to minimize ripple current into the battery. The AC ripple voltage of the rectifier DC output shall not exceed 0.5% RMS of the float voltage. The AC ripple current in the battery during float operation shall not exceed 2% RMS of the inverter full load DC current. The filter shall be adequate to ensure that the DC output of the rectifier/charger will meet the input requirements of the inverter without the battery connected.

            10. Battery Recharge. In addition to supplying power for the load, the rectifier/charger shall be capable of producing battery charging current sufficient to replace 95% of the battery discharge power within ten (10) times the discharge time. After the battery is recharged, the rectifier/charger shall maintain the battery at full charge until the next emergency operation.

            11. Battery Equalize Charge. An automatic equalize charge timer feature shall be provided to automatically apply an equalize voltage to the battery after a 30 second or longer utility outage. The duration of equalize charge time shall be adjustable from 0 to 72 hours. Manual override shall be provided for the automatic equalize circuit.

            12. Overvoltage Protection. There shall be DC over-voltage protection within each module so that if the DC voltage rises to the pre-set limit, that UPS module shall shut down automatically. Should the connected critical load exceed the capacity of the available on-line modules, the SCC (System Control Cabinet) will initiate an uninterrupted load transfer to bypass.

            13. Battery Configuration. The rectifier/charger shall function as specified with either a single battery per Multi-Module Unit (MMU) or with a single battery plant for all MMU’s.

          1. Inverter. The term inverter shall denote the equipment and controls to convert DC from the rectifier/charger or battery to precise AC to power the load. The inverter shall be solid-state, capable of providing rated output power, and for increased performance the inverter shall be a pulse-width-modulated/6-step design and utilize insulated gate bipolar transistors (lGBT). For reliability, the inverter must not utilize IGBTs in parallel.

            1. Overload Capability. The inverter shall be able to sustain an overload across its output terminals up to 150% with ±2% output voltage regulation. The inverter shall be capable of at least 300% current for momentary short circuit conditions. If the short circuit is sustained, the inverter shall disconnect automatically from the critical load bus. An uninterrupted load transfer to bypass shall be automatically initiated, should the connected critical load exceed the capacity of the available on-line modules.

            2. Output Frequency. The inverter shall track the bypass continuously providing the bypass source maintains a frequency of 60 Hz ±0.5 Hz. The inverter will change its frequency at 0.1 Hz per second (adjustable 0.01 to 1.0 Hz per second) to maintain synchronous operation with the bypass. This shall allow make-before-break manual or automatic transfers. If the bypass fails to maintain proper frequency, the inverter shall revert to an internal oscillator which shall be temperature compensated and hold the inverter output frequency to 0.1% from the rated frequency for steady-state and transient conditions. Drift shall not exceed 0.1% during any 24 hour period. Total frequency deviation, including short- time fluctuations and drift, shall not exceed 0.1% from the rated frequency.

            3. Phase-to-Phase Balance. System logic shall provide individual phase voltage compensation to obtain phase balance ±2% under all conditions including up to 50% load unbalance

            4. Fault Sensing and Isolation. Fault sensing shall be provided to isolate a malfunctioning inverter from the critical load bus to prevent disturbance of the critical load voltage beyond the specified limits. An automatic output circuit breaker shall be provided to isolate a malfunctioning module from the critical load.

            5. Load Sharing. For parallel operation, all inverter units shall automatically load-share at all times. The output current of individual UPS modules shall be no more than

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